Book Image

Raspberry Pi for Python Programmers Cookbook - Second Edition

Book Image

Raspberry Pi for Python Programmers Cookbook - Second Edition

Overview of this book

Raspberry Pi cookbook for Python Programmers is a practical guide for getting the most out of this little computer. This book begins by guiding you through setting up the Raspberry Pi, performing tasks using Python 3 and introduces the first steps to interface with electronics. As you work through each chapter you will build up your skills and knowledge and apply them as you progress throughout the book, delving further and further into the unique abilities and features of the Raspberry Pi. Later, you will learn how to automate tasks by accessing files, build applications using the popular Tkinter library and create games by controlling graphics on screen. You will harness the power of the built-in graphics processor by using Pi3D to generate your own high quality 3D graphics and environments. Connect directly to the Raspberry Pi’s hardware pins to control electronics from switching on LEDs and responding to push buttons right through to driving motors and servos. Learn how to monitor sensors to gather real life data and to use it to control other devices, and view the results over the Internet. Apply what you have learnt by creating your own Pi-Rover or Pi-Hexipod robots. Finally, we will explore using many of the purpose built add-ons available for the Raspberry Pi, as well as interfacing with common household devices in new ways.
Table of Contents (18 chapters)
Raspberry Pi for Python Programmers Cookbook - Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Hardware and Software List
Index

Performing motion tracking with OpenCV


While it is useful to be able to track objects of a specific color, sometimes we are just interested in the actual motion taking place. This is particularly true when the objects we wish to track could blend in with the background.

Note

Note: Security cameras often use IR detectors to act as triggers; however, these rely upon detecting a change in detected heat across the sensor. This means they will not work if the object does not give off additional heat relative to the background and they will not track the direction of the motion.

https://learn.adafruit.com/pir-passive-infrared-proximity-motion-sensor/how-pirs-work

The following recipe will demonstrate how OpenCV can be used to detect motion and also provide a record of where the object has been over a period of time.

The motion of an object within the frame is traced on screen, allowing the pattern of movement to be recorded and studied

Getting ready

The following script will allow us to track an object...